Machine for mortising pulleys.



R. S. BROWN. MACHINE FOB MORTISING PULLBYS.

APPLIUATION FILED JUNI: 2, 1906.

COLUMBIA pLANoGlz/u'n co.,wAsmNG'roN, D. c.

R. S. BROWN.

MACHINE FOB. MORTISING PULLEYS.

APPLIoATIoH FILED JUNE 2, 190e.

Patented 061.31, 1911.

13 SHEETS-SHEET 2.

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67 Witnesses:

oLuMBlA PLANOURAPH C0.. WASHINGTON. n. c.

R.. S. BROWN.

MACHINE FOB. MORTISING PULLEYS.

cuLumum PLANOGRAPH co.. WASHINGTON. u. C.

R. s. BROWN.

MAGHINB FOR MORTISING PULLBYsg APPLICATION FILED JUNE 2, 1906. v 1 ,007,1 80, Y Patented Oct. 31, 1911.

13 SHEETS-SHEET 4'. 0/

coLuMBlA PLANQGRAPH cu., WASHINGTON, D. c.

R. S. BROWN.

MACHINE POB. MORTISING PULLEYS.

APPLIOATION FILED JUNE 2, 190s.

Patented Oct. 31, 1911.

l? SHEETS-SHEET 5.

In venan' 247 Irowlz historney,

COLUMBIA PLANOURNH C0.. WASHINGTON. D. C.

R'. s. BROWN.v

MACHINE FOR MORTISING PULLEYS.

APVPLIATION FILED JUNE 2, 1906.

Patenteaocnsmgn.

13 SHEETS-SHEET 6.

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Witnesses R. S. BROWN.

MACHINE F011 MORTISING PULLBYS.

APPLIOATION FILED JUNE 2, 1906.

Patented 0111.311911.

13 SHEETS-SHEET 7 Witnesses:

R S BROWN MACHINE POR MORTISIN G PULLEYS.

APPLICATION FILED JUNE 2, 1906. 1,007, 1 80, Patented 0011.31, 1911.

[n mentar: I3. ,ra wiz .5y /zzsA dame@ 13 SHEETS-SHEBT 84 Patented Oct.31, 1911.

13 SHEETS-SHEET 9.

BULUMBIA PIANOGRAFH C0.,WASIIINI1I'UN, D. C.

R. S. BROWN.

MACHINE PoR vIMIORTISING. PULLEYS.

APPLICATION FILED JUNE 2, 1906. 1,007,180, Patented 001;. 31, 1911.

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lll/ll l l l l 4 R. S. BROWN.

MACHINE FOR MORTISING- PULLEYS.

APPLICATION FILED JUNE 2, 1906.

1,007,180, Patented 001;.31,1911.

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v APPLICATION FILED JUNE Z, 1906. A A

. Patented Oct. 31, 1911.

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11. s. BROWN. MACHINE FOR MORTISING PULLEYS.

APPLICATION FILED .TUNE 2, 1906.

. 1,007,180. Patented oet. 31,1911.

UNITED STATES PATENT OFFICE.

ROBERT s. BROWN, OE NEW BRITAIN, CONNECTICUT, AssIo'NoR TOVTHE lBRITAINMACI-IINE COMPANY, OE NEW BRITAIN, CONNECTICUT, A CORPORATION OF CON-NECTICUT.

MACHINE FOR MORTIsING BULLEYS.

iiaeiicedoct. s1, T9711.

Appiieation filed June 2, i906. serial No. l319,878.

To all whom it lmay concern:

ing is a specification.

of wood-pulleys.

It is of common knowledge vthat :manyefforts have been made to produce anicelybalanced wood-pulley, and in one system of manufacture this hasbeen attempted lby first gluing together the segments of the: rim, thenboring the shell thus formed, and. sawing it through in a manner toreceive.

the spokes, said spokes being Vdisposed flatwise to the plane ofrotation of the wheel, and, therefore, causing great air-resistance anda disposition of the timber in arms orv spokes in a manner to afford theleast:

strength. In another method of manufacture the arms or spokes are placededgewise to the plane of rotation of the vpulley where they have theleast air-resistance and afford great strength, and in this method thespokes have generally been placed in position while the process ofgluing the segments is under way,-the arms or spokes being thus builttogether. the pulley is completed, and the arms or spokes being in placewill preclude the turning or boring of the inside of the rim, and,therefore, a perfectly balanced pulley will not be formed. Various otherprocesses have 40 been tried for manufacturing pulleys of the characterdescribed, but they have either been impracticable, or have been too eX-pensive.

By the system of manufacture for which the present machine has beendesignedV a pulley with a perfectly-balanced rim is produced, and thisis accomplished by first boring the inner side of the rim, then chuckingsaid rim on the mo'rti'sin'g-machine and making the mortise for two orfour sets of arms (more if desired) in said rim, subsequently sawing therim apart for insertion of the tenons of the arms or spokes, and thenturning the periphery truly concentricwith the inner side of the rim.The improved In this method method of y manufacture is not, however,claimed in the present application.

Among the objects of the present invention is the provision of improvedindexingmechanism whic'h l-will control Athe position of the pulley-rimor blank Vin such a way that the number and locationof the `{mortises ci made therein may be accurately regulated This invention relates tomortising-ma-I chines many of the features of which are ofi generalutilization in the art, although pri- Y marily designed for use in themanufacture .chain is also reduced by a slippage'o'f the driving-beltdue to undue resistance of said cutter-chain.

A further object of the invention is the provision of means foractuating the head in which. the cutter-chain is mounted instead of thetable for facing-purposes.

Other objects of the invention relate to various combinations ofcO-acting elem-ents, Aand to ldetails of improvement all of which willbe hereinafter described.

In the accompanying drawings, Figure l is an end elevation of amortising-inachine involving my improvements. Fig. 2 is a sideelevationofthe machine looking in the direction of the Varrow A. Fig. 3 4is afront elevation of the upper portion of the machine, certain parts beingomitted and others shown in section. Fig. 4 is a side elevation oppositeto that shown 'in Fig. 2 'certain parts being broken away and Othersshown in section. Fig. 5 is a side Aelevation of a pulley, showing thespoke or cross-bar. Fig. 6 is a partial sectionof the pulley. Fig. 7` isa plan view of the pulley, showing the m'ortises therein. Figs. 8, 9 andl0 coinbined, constitute a longitudinal vertical section of the machine,showing the feedscrew, the chuck, and means for actuating thechuck-jaws, etc. Fig. 11 is a sectional View illustrating the end of thellower shaft of the machine opposite to thatshown in Fig. l, showing avmeans of lubrication and other details hereinafter lset forth. Fig. l1ais a side elevation ofthe eccentric-bushing, shown in section in Fig.1l. 12 is a partial horizontal section taken on 'line 1 2, 12 of Fig, 2.Fig. 13 is a detail view of the chain-tension mechanism and partscarried thereby'. Fig. 14 is a detail 'section of the same showing moreclearly the parts involved. Fig. 15 and Fig. 16 are detail views in edgeelevation and plan, respectively, of the chain-bar. Fig. 17 is a detailin section of means for securing the chain-bar, head er slide after ithas been adjusted. Fig. 18 is a partial front elevation of the chuck,parts being in section. Fig. 19 is a detail view of one of thechuck-jaws. Figs. 20, 21 and 22 are detail views of the chipebreaker,Fig. 20 being in section on line 20-20 of Fig. 21. Fig. 23 is a` bottomplan view of the indeXing-mechanism parts being in section. 24-2-1- Fig.23; and Fig. is a section taken on line 25%25 of Fig. 23; Figs. 26 and27 are, respectively, side and plan views of the chuck; Fig. 27a is adiagram showing in profile the cam carried by the chuck and cooperatingwith the indexing-mechanism; Fig. 28 is a plan view of one of thechuckjaws and its extension; Fig. 29 is a plan view of the chuck withthe face-plate removed; Fig. 30 is a side elevation of the chuck-jaw andits extension, shown in Fig. 23; Fig. 31 is a partial front view showingthe chain and chain-bar and the guardrail and chip-breaker. Fig. 32 is adetail of parts of the mechanism for actuating the Like numeralsdesignate similar parts throughoutthe several views.

Referring to the drawings, the numeral 1 designates the frame of themachine, which may be of any desired type and is illustrated as a columnrising from a base 2, and having bolted to its top a head 3 providedwith a laterally extending arm 4.

1n adjustable bearings 5 of the frame or column 1 is mounted adriving-shaft 6, provided at one end with fast and loose beltpulleys 7and 8, the belt being adapted to be shifted by the usual shipper 9 ofany approved form, and rod-and-lever mechan ism 9-92 connected thereto.(See Figs. 1 and 3.) Rigid with the shaft 6 is a large pulley 10 overwhich passes a belt 11, while loose on the shaft 6 is a steppedcone-pulley 12 driven by a belt 13 in a manner hereinafter described. 1nengagement with a pul ley 14 constituting part of the cone-pulley 12 isa crossed belt 15, while rigid with the shaft 6 at the side opposite thecone-pulley is a belt-pulley 16 over which a straight belt 17 passes.

1n adjustable bearings 18 in the base 2 of the machine is journaled adriven shaft 19, said shaft carrying looselyanounted thereon a pulley20, over which the straight belt 17 passes, and a loose pulley 21, whichis driven by the crossed-belt 15. A clutch 22 of any approved kind issplined to the shaft 19, and is actuated by a yoke 23 projecting from arock-shaft 24 journaled in the base, said rock-shaft having a lateralarm 25 on its opposite end by which it is operated in a F V2-lis asection taken on line manner hereinafter described, and said arm 25having a head 25 for a purpose herein after stated.

At one end the shaft 19 projects into a chamber 26 of the base 2containing lubricant (see Fig. 11), and is journaled in an eccentricbushing 27 having a flange 27 provided with sockets 28 in which a tool.may be inserted for turning said bushing. A spiral gear 29 is splined tothe shaft'19 and itenters the lubricant 30 as said shaft rotates, and aball-bearing b1 is located intermediate said worm and the inner end ofthe bushiilg. A lubricaut-conveying chain 32 is mounted in a groove ofthe shaft 19, and the extreme end of said shaft bears against a groovedthrust-block 33.

Designated by 34 is a shaft, stepped upon a ball-bearing 35 which issupported upon a bracket 35 between the hub of said bracket and the hubof the spiral-gear 36, secured to the shaft 34 and with which thespiral-gear 29 engages. Said shaft 34 passes through the hub of bracket35 and on its end is threaded to receive a nut 352 to prevent verticaldisplacement thereof. A covering-plate 37 is bolted to the open side ofthe chamber 26 and carries a valve or faucet 38 for drawing off thecontents of said chamber (see Fig. 7 A screw 39 is inserted through thewall of chamber 26 and the point of the screw enters a V-shaped groove40 in the hub of the eccentric bushing 27.

Referring to Fig. S, in the top of the chamber 26 is an opening 41closed by a cover 42, and through this opening lubricant may be suppliedto said chamber. A screw 43 is fitted in a groove 44 of the column 1,being journaled at its upper end in an overhang 45 of said column, andis rigid with the shaft 34 at its lower extremity, said screw engaging anut 46 carried by a slide 47 gibbed to ways 48 and 49 of the column, andsaid column being longitudinally grooved as stated (Fig. 8) to permittravel of the nut. Slide 47 is provided with a way 50 and has a chamber51` and on this way is fitted for transverse adjustment a slide 52gibbed to said way, as illustrated in Fig. 8, said slide 52 having atubular hub 53. For adjusting the slide 52 any desired means may beemployed, and shown for this pun pose are a rack 54 secured to slide 47and a pinion 55 rigid with a tubular shaft 55. Fitted for rotarymovement on the slide 52 is a chuck face-plate 56, gibs 57 securing itin place, and said face-plate having a series of radial slots 58 for thereception of the bases 59 of chuck-jaws 6() projecting laterally fromsaid slides, as shown in Fig. 13.

From what has been stated it will be manifest that the chuck has amovement up and down on the frame or column 1, and that it may beshifted from left to right to place the pulley-rim in a new position forenlarging a mortise already made by a second cut of the chainhereinafter described,- this right and left movement being produced bythe rack and pinion set forth, and said movement being limited at eitherside by adjustable set-screws 61 carried by brackets 62 rigid with theslide 47,-said setscrews being illustrated in Figs. 3, 26 and 29. In theouter face ofthe slide 52 are sockets disposed in the illustrationsgiven quartering about the circular periphery of the slide upon whichthe chuck-faceplate 56 is secured by the gibs 57, as before stated.Secured to the chuck-face-plate 56 in Figs. 8 and 18 is an arm 64, saidarm having at its inner end a series of projections 65, through whichscrew-bolts 66 pass. This arm is of a shape in cross-section shown inFig. 18, and is provided at one end with a longitudinal bore 67 for thereception of a sliding rod 68 having a manipulating knob 69 at its outerend and a locking-dog 70 at its inner end, said locking-clog beingadapted to fit in any of the sockets of the slide 52, and to thus locksaid slide and` chuck-faceplate together, after an indexing movement hastaken place, as will be hereinafter described. Between a collar 71 onrod 68 and bushing 72 threaded into the arm 64 is mounted a coiledspring 73, the function of which is normally to propel the rod and itslocking-dog inward, and, therefore, to cause the chuck face-plate to belocked to the slide 52. In another longitudinal bore of the arm 64 ismounted a tubular shaft 74 having a hand-wheel 75 at its outer end, anda beveled gear 76, rigid with its inner extremity, said bevel-gear beinglocated in a bore 77 of the hub of the chuck-face-plate, and said gearintermeshing with pinions 78 (see Fig. 27) rigid with the screws 78 foractuating the chuck-j atv-slides 59, and thereby simultaneously shiftingsaid slides either toward or from the axis of the chuck-faceplate.

Mounted within the tubular shaft 74 is another tubular shaft 55 carryingthe pinion 55 heretofore described at its inner end and provided with ahand-wheel 80 atits outer end, thereby affording means for adjusting theslide 52 transversely of the slide 47, the limit of adjustment beingregulated in either direction by set-screws 61 heretofore described.Mounted in the tubular shaft 55 is a pull-rod 81 provided at its innerend with an enlargement terminating in a coneplug 82 which normallyrests within a centering socket 83 in the slide 47, as illustrated inFig. 8. A button 84 is secured to the outer end of the rod 8l, and aspiral-spring 85 is located between a collar 86 on the rod, and theinner end of the bore in the tubular shaft 55, said spring servingnormally to advance the pull-rod, illustrated in Fig. 8,

'sition.

At its inner end the hub of the chuck faceplate 56 has rigid with itssurface a cana 87 and coperating with said cam is a roller 88 journaledin an arm 89 "secured to a rockshaft 90 mounted in a bracket 91 and inthe slide 52. Upon this rock-shaft 90 (see Figs. 1, 2, 3 and 32) issplined the hub 92 of an arm 93, said arm having an internallythreadedsocket adapted to receive the threaded shank of a ball constituting onemember of a universal oint, said ball being fitted within socket 97carried by the rod 98, equipped at its upper end with a socket 99receiving the ball which is rigid with the rod 101, and, therefore,constituting another universal joint. On the reverse end of the rod 101is a grooved sector 101 adjusted in the larger sector 102, said sectorbeing splinedupon the index-controllingrod 103. A bracket 104 having avertical arm is bolted to a flange of the slide 47 and this bracket isprovided at its upper end with a head 105 provided with perforated ears106-106 for the reception of the rods 103 and 110. A sliding connectionis established between the sector 102 and rod 103 by a spline andfeather as illustrated in Figs. 3 and 32. At its lower end the rod 103is provided with a bifurcated block 103', said block being perforated toreceive the lower end of the rod passing through an arm 107, said armbeing positionedbet-ween the ears of the bifurcated block and projectingfrom a shipper-dog 108, secured by a screw 109 to a rod 110. At itsinner end this 'shipper-dog 108 is of yoke-shape, and in the arms 111,111 of the yoke are fitted adjustable stops 112, 112 equipped with nuts113, 113 by which they may be adjusted, said stops being locatedopposite the head 25 of the arm 25, secured to the rock-shaft 24 abovedescribed.

Designated by 114 is a treadle pivoted on a shaft 115 journaled in abracket 116 of the base 2, and this treadle is connected in any desiredmanner to the rod 110. A collar 117 is secured to the rod 110, andsurrounding said rod between said collar and a perforated bracket 118projecting from the base 2 is a coiled spring 120. This rod 110 passesthrough the head of the bracket 104 projecting from the slide 47, andenters at its upper end the perforated armv121 of a bracket 122 rigidwith the overhanging arm 4 of the head 3.

A stop 123 is adjustably secured by a screw 124 actuated by a slidinghandle 125 to the rod below its upper end, and another stop 126 isadjustably connected to said rod by a screw 127, operated by asliding-handle 128 at a point on said rod beneath the head 105 ofbracket 104. Figs. 2 and 3.)

(See

As illustrated in Fig. 2 a coiled spring '129 is connected at one end toa pin 180 of the rocking-rod 108, and at its opposite extremity to astud 131 of the head 3. Adjacent Ato its upper end the rod 108 passesthrough a bearing 132 of the bracket 182 projecting from the arm 4 andabove said bearing said rod is provided with a lockinghead or dog 188consisting of two separated arms 183, 13S-32 (see Figs. 28, 24 and 25)coperating with an index-plate 134 hereinafter described. A perforatedplunger bracket 1235 (see Figs. and 23) is secured to the top of the arm4 by screws 186, and through the jvierforation in said bracket passes aplunger 187 swiveled upon a bolt 188 passing through ears 139 of a lever140 pivoted at 141 to the side of the arm 2, as illustrated in Fig. 4.

Referring to Figs. 2, 8, and 12, designated by 142 is a rod to which thelever 140 is pivoted at 140, said rod passing through a bracket 143bolted to bracket-arm 144 secured to the outer end of arm 4, anddepending below said arm. Stud-shafts 145 and 146 project from thedepending part 144 of said plate, and on the stud-shaft 145 is looselymounted a gear-wheel 147, carrying rigid with its outer face a disk 148provided with a series of slots or grooves 149, each open at its outerend. Sleeved on the stud-shaft 146 is a wheel 150 to the hub 151 ofwhich is secured a manipulating-wheel or disk 152 having handles 153,and in the inner side of said wheel 152 is formed an oblong cam-groove154, shown by dotted lines in Fig. 3. fit its lower end the rod 142 isflattened at 142 and in said flattened portion is formed a slot 1422which fits over the stud-shaft 145, a nut 155 on said shaft securing itin place, and a washer 156 also on the stud-shaft, separating saidflattened portion of the rod from the disk 148. Ad jacent to its lowerextremity the flattened portion 142 is provided with a roller-stud 157which enters the cam-groove 154. Pins 150 extend inward from the wheel150 and are adapted to enter the slots 149 in the disk 148 when saidwheel is turned.

Designated by 158 is a slip-gear mounted on the hub 159 (see Fig. 12) ofa disk 159 secured tothe end of a shaft 160, said disk having curvedslots 1592 through which screw-bolts 161 pass to engage the gear 158,the function of said slip-gear being to change the relation between thehand-wheel 152 and the movable head carrying the mortis ing mechanism,as will hereinafter appear. A screw 168 is formed on shaft 160, saidscrew passing through the arm 4, and engaging a nut 164 rigid with acutter-carrying head or carriage 165 movable in a guideway 166 of thehead 8 of the column and the arm 4. See Figs. 5 and 12. Carried by thishead and journaled in a bearing-bracket 167 thereof is a sliding shaft168, provided with longitudinal grooves 169 which re receive splines orfeathers 170 from a bushing 171 secured by screws 172 or otherwise, to acomparatively wide, flanged beltpulley 173.

Designated by 174 is a sleeve or bushing lixedly secured in a bearing175 of the machine-top by screws 176 the pulley being bushed at 177 torotate on said sleeve and being prevented from displacementlongitudinally by a flange 178 on the sleeve 174 and the end of thebearing 175. To the bearing 175 is secured a fixed collar 179 fittedagainst the right hand end of said bearing, and projecting from saidcollar is a shield 174, provided at its end with a closure or knob 180,for the shaft 168. On the extreme inner end of the shaft 168 are xed asprocket-wheel 181 (see Figs. 12 and 14) and a collar 182, and betweensaid collar and a reduced end of the bearing 167 is secured to saidbearing by screws 188 a fancase 183 for the reception of a suction-fan184 of usual construction rigid with the shaft 168. `A hood 185 hingedto the fancase at 185 surrounds the end of the shaft 168, said hoodcommunicating with said fan-case in the usual manner.

An endless cutter-chain 186 is driven by the sprocket-wheel, and passesover rollers 187 and 188 (see Figs. 15 and 16) j ournaled onroller-bearings 189 in the lower end of a chain-bar 190, said chain-barbeing secured at its upper end to an adjustable block 191 by screws 192.Depending from the bearing-bracket 167 (see Figs. 14 and 17) is agrooved hanger 198, and in a socket of the block 191 is fitted a shankof a T-headed bolt 194, the head 194 of which fits in a groove 195 ofsaid hanger. In this bolt is formed a conical depression 195 for thereception of the conical end 196 of a screw 197 threaded into the block191, and having a finger-grasp or hand-wheel 198, said bolt serving tolock the block to the hanger after it has been adjusted. In a lateralextension 199 of arm 199 rising from the bearing 167 of head 165 isjournaled a screw 200 having a hand-wheel 201, and below said handwheela bevel-gear 202, the thread of said screw engaging a socket in across-section 208 connecting standards 204 rising from the block 191sothat said block 191 may be raised and lowered on the head and thensecured in place by the screw 197.

Journaled in bearings 205, 206 (see Figs.

3 and 4) of laterally-projecting arms 205 199 of the head is an inclinedshaft 207 carrying a bevel-gear 208 at its upper end and a hand-wheel209 at its lower extremity, whereby the screw 200 and the block 191 maybe actuated to regulate the tension of the cutter-chain either by thewheel 201 or the wheel 209, the latter owing to the height of themachine being brought down within convenient reach of the operator.

Later-ally extending from the slide-block 191-one at each side thereof,are arms 210, 211', each having a head 210-211, respectively, perforatedto receive devices hereinafter described. Sliding in the perforated head210 (see Fig. 31) is a guard-rod or bar 214, while in the opposing head21.1 of arm 211 is fitted for sliding movement a rod 215 of achip-breaker-head 216 secured to the end of said rod by a screw 217.These rods 214, and 215 are connected by a curved yoke 218 havingperforated hubs 219 through which said rods pass, and in which they areadjustably secured by screws 220, one of which is shown in Fig. 13.

From the yoke projects an arm or table 221, and on the rod 215 of thechipbreaker, above said table, are sleeved weights 222 which may vary innumber and normally tend to force the yoke` and its attached rodsdownward to cause the chip-breaker to bear against the work underyielding pressure, as set forth in my Patent No. 673,378 dated May 7,1901, to which reference may be had.

Referring to Figs. 20, 21, and 22 it will be seen that the head or block216 is provided with a socket 216 in which the end of rod 215 is securedby a pin 2232, and is also provided with a rectangular opening 2162 forthe reception of the chip-breaker proper 223 which comprises a bar ofwood or other suitable material inclined at its inner end at 223 to restupon the work adjacent to the mortise being formed and prevent the upperedge of said mortise from being damaged by splintering or breakingadjacent to the upper run of the cutter-chain. In the opening 2162 ofthe head 216 is placed an inwardly-flanged metal bar 224 from theforward end of which projects a chute 225 for receiving the shower ofchips or cutting removed by the cutter-chain and directing them towardthe hood 185 of the fan-case 183. This bar merges at its lower end intothe chute 225 for which it constitutes a reinforce, its side 224 bearson the outer surface against the wall of the opening 2162, and on itsinner surface against the bar or stock 223, and its flange 2242 islocated intermediate the tcp of the stick and the upper wall of theopening 2162. Threaded into the block 216 a screw 217 having a knurledhead 227, and by turning said screw its inner surface may be made tobear against the bar 224 and t-hus force the stick 223 laterally againstthe wall of the opening in which it is placed to clamp it firmly inposition, in vir.- tue of which the screw will bear upon said metallicarm instead of directly againstthe stick as in the old constructions. Byloosening the screw the chip-breaker may be readily adjusted back andforth, and as the end of the screw is always forced against a metallicpart of the fixture no damage can be done to the wood of the stick.

As heretofore stated the belt 11 from the pulley 10 of the shaft 6actuates the pulley 173, and on the inner end of said pulley 173 is asmall stepped pulley 173 for driving the belt 13 and stepped pulley 12loose on said shaft 6. As has also been stated a crossed belt 15 isdriven from the element 14 of the loose pulley 12 and drives a pulley 21loose on shaft 19 journaled in the base 2, while a pulley 16 rigid withsaid shaft 6 operates a straight belt 17, and, through said belt, apulley 20 loose on said shaft 19,--said pulleys 2O and 21 beingalternately connected to the shaft by the clutch 22, or permitted idlyto rotate thereon when the clutch is thrown to a neutral position. It,therefore, appears that the shaft 19 is driven in the feed direction bybelting operated from the shaft 168 kwhich drives the cutter-chain, andas said `shaft 19 actuates the spiral-gearing described the screw 43 isalso operated either to advance or withdraw the slide 47.

lVith the use of slight chain-bars in making small mortises, it has beenfound in practice that through over feeding of the work-support, theencountering of a knot or other unusual resistance, or the employment ofadull cutter-chain, there is a tendency to force the feed more rapidlythan the cutterchain can stand, and, hence, the chain-bar will spring orwabble and an imperfect mortise will be formed,-this condition beingaggravatedwhen the main driving belt supplying power to thecutter-actuating; shaft slips, while the feed-mechanism driven fromanother source keeps in motion. In the `present constructionthefeed-mechanism is driven by belting from the cutter-driving shaft orspindle, and, hence, the feedingspeed will be reduced whenever, due tothe unusual conditions specified the speed'of the cutter-chain isreduced. In other words, by controlling the speed of the feed-mechanismby the speed ofthe cutter-driving shaft a proportionate relation isalways maintained between the two, so that said cutter drivingshaft willalways be effective in driving the shaft 19 of the speed-mechanism in amanner entirely to avoid all of the above-noted objections.

Designated by 227 (Figs. 28 and 30) are I extension chuck-jaws, eachcomprising a base 228 having a perforated bracket 229 dependingtherefrom through which the screw 78 passes and acts as a guide lforsaid extension-jaw. A bolt 230 secures said eX- tension-jaw to themainjaw 60 at a point about in line with the top of the slide 59, andeach extension-jaw is reinforced and channeled at 231 toreceive itsslide 59, and is provided at its outer end with a serrated face 232having at its lower end a lip-oriange 232' against which the edge of thepulley-rim rests. Stop-screws or pins 233 (Fig. 1S) prevent thechuck-jaw-slides 59 from running oit their act-uating screws when spreadto the full limit of their movement. 1n each end of the slide 47 a V-shaped recess l17 is formed, leaving intermediate each recess an arm G2of the slide 47, each carrying the bracket G2 for the stopscrews 61.(See Fig. 29.)

Re'verting toA the indeXing-mechanism (see Figs. 23, 24: and 25) aprotect-ing cover 234 is secured to the plate 134, and adjacent to theinner edge ot said plate is a line of perforations 235 and alongitudinal slot 236 for the reception of a sliding bar 237, having aknob 23S by which it may be manipulated to cut out the desired number ofperorations as illustrated in Fig. 23. Plate 134 and its hood or coverare adjustably secured to the slide 165 by bolts 239 passing throughslots 240 in the plate. A longitudinal slot 24:1 is formed in theindex-plate 134, and in each edge of said slot are concave seats ordepressions 242 and 243, the pairs of which are separated by projections244 on one edge and 245 on the opposite edge, the seats and projectionsbeing located in opposing pairs diagonally opposite each other. In theslot is loca-ted the reduced part 1333 of the indexing-dog 133, the prowjections 133 and 1332 of which being, when the rod 103 is in theposition shown in Figs. 24 and 25 above and below the indexingplate.

Pulleys of the kind to be mort-ised in this machine are composed ofplies of wood glued together in a manner to break joints around thecircumference of the rim, these plies in the illustration Figs. 5, 6 and7 being indicated in a nine-ply pulley by the letters a, 7), o, (Z, e,f, g, 7L, and i, although said pulleys may be of any desired diameterand may be composed of any required number of plies.

Referring to Figs. 4, 6, 7 and 31 the pulley-rim to be mortised isillustrated, and is indicated by the numeral 246, the plies being markedby the letters a, Z), etc., above set forth. After the pulley-rim hasbeen mortised at points directly opposite each other in each alternateply as at 7a, Z and fm, in the illustration given, it is sawed apart onthe line 247 for the reception of the tenons 248 of the spokes, kerts orslots 249 separating each pair of tenons, and serving to permit freepassage of air. Each half-spoke 250 is provided with a pair of separatedperforations 251, on each side of the half-groove 252 of thespoke-section for the reception of bolts 253 for securing the halvestogether to form the complete pulley, the bolts carrying nuts 254e ateach end which bear against washers 355 and wood strips 356 beneath saidwashers.

lVhen the tenons 24S of each spoke-section have been glued in theirmortises, the halves of the pulley are placed together, and firmlyclamped in place by the bolts and nuts described, the result being aperfectly-bal anced pulley the spoke or spokes of which are of aconstruction to al'lord the maximum of strength and the leastair-resistance when the pulley is in use. While but one spoke is shownany suitable number of spokes crossing each other may be employed ifdesired,

the ends thereof being mortised into ditlerent plies ot the pulley. Forinstance if two spokes or arms were employed they would preferably crossat right angles, their tonons extending into alternate plies. Thus it asecond arm were to be added to the pulley shown, its tenons would bemortised into plies c, e, and g. 1n a case ot this kind. it is apparentthat circumferentially adjacent mortises occur in alternate plies and itis to insure this disposition otA said mortises that certain featuresabout to be described are associated with the indexing mechanism.

Shown in section in Fig. 8 and projected to show the profile in Fig. Q7ais the cam 37 which as the chuck is rotated by hand controls themovement of the indexingmechanism, the face of said cam being in contactwith the roller 88 carried by the arm 39 pinned to the shaft 90 asstated. Referring to said Fig. 27" this cam is equally divided into twohigh and two low portions separated by inclined surfaces as 37, 372,373, 874, and 375 thus making the changes 90 degrees apart or in otherwords the two low portions and the two high portions are respectivelydiametrically opposite each other. In preparing a pulley for one arm itis clearly apparent that the mortises therefor are made diametricallyopposite in the saine plies and that the various positions ot' thetool-head for forming said mortises in one side of the pulley willexactly correspond with the proper positions for forming those in theopposite side. Now it.' a second arm is to be added its receivingmortises will be half way between, both circumferentially andlongitudinally, the mortises for the iirst arm. As stated the roller S8is always in contact with the cam-surface, and when the chuck tace plate5G is in any one of its locked positions said roller will be in Contactwith either a high or a low portion ot the camsurface. From this itfollows that it the chuck is given a half reif'olution. as would be doneto form diametrically opposite mor tises for a pulley having one arm,the relative position of the cam-roller 83 will remain the same andconsequently the head 133 cooperating with one of the series of notchesin the index plate 134 to govern the positioning ot head 165 will not beaii'lected, if however the chuck is given a `toni-th of a revolution, aswould be done to form quartering mortises for a two arm pulley, thecam-roller will be moved to its eXtreme relative position therebyshifting the head 133 to coperate with the opposite series of notches inthe index plate 134 which will so affect the positioning of head 165 asto bring the circumferentially adjacent mortises in alternate plies.

In the operation of the machine a pulleyrim 246 is placed upon thechuck-jaws 60 or the extensions of said jaws 227, as determined by thediameter of said rim, and the wheel 152 is then turned to actuate thescrew 163 through interposed mechanism and adjust the sliding head 165to the proper position to bring the cutter-chain 186 and chain-bar 190to a point opposite the ply in which the first mortise is to be formed.If a fixed relat-ion existed between the gears 147 and 158 there wouldbe no certainty that the step b'y step movement imparted to the head 165by the mechanism described, would bring the cutter-chain into exactalinement with the desired ply, but the adjustability of gear 158,obviously provides means whereby the proper relation to secure thedesired alinement may be readily obtained. As soon as the head ispositioned by the wheel 150 whose pins enter the slots 149 in disk 148,the rod 142 is actuated by the cam 154 of wheel 152 thereby pulling`down the outer end of the pivoted lever 140, and causing the pin 137 atits opposite extremity to enter the perforaf tion 235 then opposite saidpin, and to lock the parts in place. Vhen this operation has beenproperly carried out and the pulleyrim is in correct position thetreadle 114 can be depressed, to pull down the rod 110, the shipper dog108, and the rod 103.

sliding head has been brought to the correct place the arms 133 1332 ofhead 133 will occupy the position illustrated in Figs. 23 and 24, andwill pass freely through the slot 241 and the groove 243, and thus willnot impede the downward movement of the rod 103, but if said arm shouldbe in a wrong position a block will occur and the treadle can notdepress said rod to shift the clutch and start the feedmechanism inaction. Assuming the parts to be in correct position the treadle will bedepressed and through the connections described will pull down the rods103, 110, rock the shaft 24 and shift the clutch 22 into engagement withthe pulley 21, and the crossed belt 15, actuated by the means describedfrom the cutter driving-spindle 168, will now rotate the shaft 19 andthe spiral gear 29 of said shaft will rotate the spiral gear 36 whichactuates the screw 43, thereby imparting an upward movement to the slide47 and forcing the pulley-rim 246 into contact with the cutterchain 186,thus forming a mortise in the ply b of said pulley, as illustrated inFig.

, tions already performed. If the indexing-plate 134 carried by the 31,the presser-foot or chip-breaker being in contact with said ply at thistime and performing their usual functions until said mortise iscompleted. As the slide 47 moves upward it carries with it the bracket104, and when the head 105 of said bracket engages the adjustable stop123 of rod 110 it will raise said rod, and through the shipperdog 108,ship the clutch to a neutral position to stop the feed after which saidclutch may be manually or otherwise suitably operated to reverse thefeed so as to lower the work away from the cutter chain. As the rod 110is elevated the rod 103 moves with it and the head 133 moves through theindexing-plate 134 and will release said plate for a furtherindexing-movement of the toolhead to bring it into position for forminga mortise in the alternate ply CZ of the pulleyrim. By rotating thewheel 152 the mechanism associated therewith is actuated to rotate thescrew 163 sufficiently to bring the sliding head, its cutter-chain andchain-bar to a position opposite the ply (Z above mentioned of thepulley-rim, and if this position is a correct one the treadle may againbe depressed lto repeat the operation, and so on until the four mortisesare formed in the upper part of the pulley-rim,-each mortise being madein an alternate ply of said pulley-rim as stated.

After a series of mortises suitable for the pulley-rim being acted uponhas been formed it becomes necessary to rotate the chuck and the pulleythereon one-half turn or in other words to bring a new part of thepulley directly opposite said mortises in position for an exact replicaof the opera- To accomplish this the knob 69 is grasped and the rod 68is pulled outward to release the locking-dog 70 from the slot or groove63 in the manner stated, and said rod will remain in a withdrawnposition while t-he chuck and pulley are rotated about thecircumferential periphery of the slide 52 sufliciently far to bring theother part of the pulley into position for correct mortising-operation.W'hen said rod is released the spring 73 will immediately force itforward to cause the locking-dog again to engage a slot or groove 63 ofthe part 52. During the rotation of the chuck to effect this changedposition of the pulley the cam 87 is also rotated, and through therock-shaft 90 and ball-andsocket connections described will rot-ate theshaft 103 to bring the head 133 in proper position with relation to theindex-plate 134, which position, when the mortises are to bediametrically opposite as in this case, will correspond with theoriginal position. The mechanism associated with the chuck andcoperating with the index-plate 134 insures the proper relativepositioning of the pulley-rim and cutter-chain head, therefore

